Vaporizing burner device

ABSTRACT

A vaporizing burner includes a flame chamber and inserted therein a vaporizing body comprising a heat conducting material. The vaporizing body has the shape of a spoon bowl, the inner side of which is provided with a coating of a capillary acting, heat insulating material, e.g. ceramic fibers. The spoon bowl is so placed in relation to the flame chamber, that at normal combustion the flame sweeps along the underside of the spoon bowl.

United States Patent 11 1 1111 3,869,245

Hagman Mar. 4, 1975 VAPORIZING BURNER DEVICE 2,366,839 1/1945 De Lanceym. 431/333 1 Inventor: Gustav Rune g g, 2,663,366 12/1953 Harris 431/3 6 Sweden FOREIGN PATENTS OR APPLICATIONS [73] Assignee: Monaflbcrescem AB Varberg, 263.413 12/1949 Switzerland 431/326 Sweden Przmary Examiner-Carroll B. Dorlty, Jr. [22] FIed: May 1973 Attorney, Agent, or Firm-Alter, Weiss, Whitesel & 1211 Appl. No.: 361,965 Laff [30] Foreign Application Priority Data [57] BSTRACT I A vaporlzlng burner includes a flame chamber and 1n- June 14, 1972 Sweden 7377860 Serted therein a vaporizing y Comprising a heat conducting material. The vaporizing body has the [52] [1.8. CI. 431/326, 431/333 Shape of a Spoon bowl, the inner Side of which is p [51] Int. Cl. F23d 3/40 v1ded wltha coating of a caplllary actmg, heat msulat- [58] Field of Search 431/326, 333 g material, g ceramic fibers. The Spoon bowl is so 1561 11212111121151. 131;55125321323113;1:12,:

UNITED STATES PATENTS of the Spoon bOwL 2,244,178 6/1941 Senior et al 431/326 2333.815 11/1943 Petsel 431/326 3 Clam, 1 Drawmg Flgu" VAPORIZING BURNER DEVICE This invention relates to a vaporizing burner device, said burner including a flame chamber and inserted therein a vaporizing body comprising a heat conducting material. The material is provided on its effective vaporizing surface with a capillary acting coating.

The coke accumulations in a vaporizing burner can be considerably reduced by coating the vaporizing surface with a capillary acting material. Thus, each particle of the fuel is vaporized at its right vaporizing temperature and that smallest possible combustion residue remains. According to known methods, the vaporizing chamber wall is coated with the porous material.

This, however, leads to the disadvantage that the vaporizing chamber wall, at the same time, has also been heat insulated and that substantially all of the required vaporizing heat has been obtained through radiation from the flame. Therefore difficulties have arisen to get a stable flame front, due to the fact that variations in the radiation heat cause an unstable vaporizing zone.

It is a main object of this invention to solve this problem. According to the invention the vaporizing body has the shape of a spoon bowl, provided on its inner side with a coating, of a heat insulating material, e.g. ceramic fiber. The spoon bowl is so placed, in relation to the flame chamber, that at normalcombustion the flame sweeps along the uncoated underside of the spoon bowl.

Other objects and advantages of the present invention will become apparent from consideration of the following description taken in connection with the accompanying drawing, showing in section a vaporizing burner provided with the inventive device.

in the drawing 1 is a combustion air channel leading to a flame chamber 2, in which the flame is burning. A flame holder 7 is inserted between the flame chamber 2 and the combustion chamber 3.

According to the invention the vaporizing body has been formed as a spoon bowl 6, inserted into the flame chamber 2 on its inner side bowl 6 is provided with a coating of an insulating, porous and capillary acting material 4, e.g. ceramic fiber, which has a very good heat resistance (llOl400C). To the inside of the spoon bowl 6 is connected a fuel inlet 5. The capillary acting coating 4 contributes to the right distribution of the liquid fuel over the vaporizing surface.

During operation the underside of the spoon bowl 6 will be swept over by the flame. The heat from the flame is conducted in the bowl material in upstream direction to give the uniform temperature distribution which a stable vaporizing front requires.

The spoon bowl 6 is made detachable, so it easily can be replaced, if it after operation a long time does not function in the intended way.

I claim:

1. A vaporizing burner device comprising a flame chamber surrounded by spaced apart inner and outer elongated casings forming an air passage into the flame chamber, the inner elongated casing terminating at one end in a flame holding baffle having a first central opening therein for enabling the egress of the spent combustion gas, the inner elongated casing terminating at the other end in a second central opening aligned with said first central opening for enabling the total ingress of fresh air from said passage, the elongated outer casing having an opening at one end for the intake of fresh air and being closed at the other end for directing air in the air passage through said second central opening, through said flame chamber and toward said first central opening, an elongated spoon bowl shaped body of heat conductive material lined on the inside of the bowl with a coating of capillary acting insulating material, means for supporting said spoon bowl with the elongated axis of the bowl being generally aligned with the elongated axis of said elongated casings, said bowl having a tip end extending from the inside of the outer casing through said second central opening and into said chamber with substantially free passage of said ingress air surrounding said bowl and moving toward said tip end, said bowl having a rear end extending back from said second central opening toward the closed end of said outer casing, and fuel inlet means for conveying liquid fuel into the rear end ofsaid bowl at a rate whereby the capillary action of the insulating material conveys the fuel over the inside surface of the spoon bowl.

2. A device as claimed in claim 1 and means for replaceably mounting the spoon bowl with the coating in the burner.

3. A device as claimed in claim 1, wherein the coating comprises ceramic fibers.

l l =l l 

1. A vaporizing burner device comprising a flame chamber surrounded by spaced apart inner and outer elongated casings forming an air passage into the flame chamber, the inner elongated casing terminating at one end in a flame hoLding baffle having a first central opening therein for enabling the egress of the spent combustion gas, the inner elongated casing terminating at the other end in a second central opening aligned with said first central opening for enabling the total ingress of fresh air from said passage, the elongated outer casing having an opening at one end for the intake of fresh air and being closed at the other end for directing air in the air passage through said second central opening, through said flame chamber and toward said first central opening, an elongated spoon bowl shaped body of heat conductive material lined on the inside of the bowl with a coating of capillary acting insulating material, means for supporting said spoon bowl with the elongated axis of the bowl being generally aligned with the elongated axis of said elongated casings, said bowl having a tip end extending from the inside of the outer casing through said second central opening and into said chamber with substantially free passage of said ingress air surrounding said bowl and moving toward said tip end, said bowl having a rear end extending back from said second central opening toward the closed end of said outer casing, and fuel inlet means for conveying liquid fuel into the rear end of said bowl at a rate whereby the capillary action of the insulating material conveys the fuel over the inside surface of the spoon bowl.
 2. A device as claimed in claim 1 and means for replaceably mounting the spoon bowl with the coating in the burner.
 3. A device as claimed in claim 1, wherein the coating comprises ceramic fibers. 